The pupil controls how much light enters the eye, allowing for clear vision. In low light, pupils widen to let in more light, and in bright light, they narrow to prevent too much light from entering.
December 23, 2025 #25102: Happy Camper Katie is a hiker and camper but she called the least ‘outdoorsy’ guys possible to find out if it’s safe to pour her old camp stove fuel into her car’s gas tank.
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